i2c: designware: Consolidate firmware parsing and configuring code

We have the same code flows in the PCI and platform drivers. Moreover,
the flow requires the common code to export a few functions. Instead,
consolidate that flow under new function called
i2c_dw_fw_parse_and_configure() and drop unneeded exports.
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

drivers/i2c/busses/i2c-designware-common.c

@@ -20,6 +20,7 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/swab.h>
@@ -188,7 +189,7 @@ static const u32 supported_speeds[] = {
 	I2C_MAX_STANDARD_MODE_FREQ,
 };
 
-int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
+static int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
 {
 	struct i2c_timings *t = &dev->timings;
 	unsigned int i;
@@ -208,7 +209,44 @@ int i2c_dw_validate_speed(struct dw_i2c_dev *dev)
 
 	return -EINVAL;
 }
-EXPORT_SYMBOL_GPL(i2c_dw_validate_speed);
+
+#ifdef CONFIG_OF
+
+#include <linux/platform_device.h>
+
+#define MSCC_ICPU_CFG_TWI_DELAY		0x0
+#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE	BIT(0)
+#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER	0x4
+
+static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
+{
+	writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
+	       dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
+
+	return 0;
+}
+
+static void i2c_dw_of_configure(struct device *device)
+{
+	struct platform_device *pdev = to_platform_device(device);
+	struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+	switch (dev->flags & MODEL_MASK) {
+	case MODEL_MSCC_OCELOT:
+		dev->ext = devm_platform_ioremap_resource(pdev, 1);
+		if (!IS_ERR(dev->ext))
+			dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
+		break;
+	default:
+		break;
+	}
+}
+
+#else	/* CONFIG_OF */
+
+static inline void i2c_dw_of_configure(struct device *device) { }
+
+#endif	/* CONFIG_OF */
 
 #ifdef CONFIG_ACPI
 
@@ -255,7 +293,7 @@ static void i2c_dw_acpi_params(struct device *device, char method[],
 	kfree(buf.pointer);
 }
 
-void i2c_dw_acpi_configure(struct device *device)
+static void i2c_dw_acpi_configure(struct device *device)
 {
 	struct dw_i2c_dev *dev = dev_get_drvdata(device);
 	struct i2c_timings *t = &dev->timings;
@@ -286,7 +324,6 @@ void i2c_dw_acpi_configure(struct device *device)
 		break;
 	}
 }
-EXPORT_SYMBOL_GPL(i2c_dw_acpi_configure);
 
 static u32 i2c_dw_acpi_round_bus_speed(struct device *device)
 {
@@ -308,11 +345,13 @@ static u32 i2c_dw_acpi_round_bus_speed(struct device *device)
 
 #else	/* CONFIG_ACPI */
 
+static inline void i2c_dw_acpi_configure(struct device *device) { }
+
 static inline u32 i2c_dw_acpi_round_bus_speed(struct device *device) { return 0; }
 
 #endif	/* CONFIG_ACPI */
 
-void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
+static void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
 {
 	u32 acpi_speed = i2c_dw_acpi_round_bus_speed(dev->dev);
 	struct i2c_timings *t = &dev->timings;
@@ -328,7 +367,24 @@ void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev)
 	else
 		t->bus_freq_hz = I2C_MAX_FAST_MODE_FREQ;
 }
-EXPORT_SYMBOL_GPL(i2c_dw_adjust_bus_speed);
+
+int i2c_dw_fw_parse_and_configure(struct dw_i2c_dev *dev)
+{
+	struct i2c_timings *t = &dev->timings;
+	struct device *device = dev->dev;
+
+	i2c_parse_fw_timings(device, t, false);
+
+	i2c_dw_adjust_bus_speed(dev);
+
+	if (device->of_node)
+		i2c_dw_of_configure(device);
+	if (has_acpi_companion(device))
+		i2c_dw_acpi_configure(device);
+
+	return i2c_dw_validate_speed(dev);
+}
+EXPORT_SYMBOL_GPL(i2c_dw_fw_parse_and_configure);
 
 static u32 i2c_dw_read_scl_reg(struct dw_i2c_dev *dev, u32 reg)
 {

drivers/i2c/busses/i2c-designware-core.h

@@ -416,11 +416,4 @@ int i2c_dw_baytrail_probe_lock_support(struct dw_i2c_dev *dev);
 int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev);
 #endif
 
-int i2c_dw_validate_speed(struct dw_i2c_dev *dev);
-void i2c_dw_adjust_bus_speed(struct dw_i2c_dev *dev);
-
-#if IS_ENABLED(CONFIG_ACPI)
-void i2c_dw_acpi_configure(struct device *device);
-#else
-static inline void i2c_dw_acpi_configure(struct device *device) { }
-#endif
+int i2c_dw_fw_parse_and_configure(struct dw_i2c_dev *dev);

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -253,7 +253,6 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 	int r;
 	struct dw_pci_controller *controller;
 	struct dw_scl_sda_cfg *cfg;
-	struct i2c_timings *t;
 
 	if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers))
 		return dev_err_probe(&pdev->dev, -EINVAL,
@@ -288,9 +287,6 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 	dev->irq = pci_irq_vector(pdev, 0);
 	dev->flags |= controller->flags;
 
-	t = &dev->timings;
-	i2c_parse_fw_timings(&pdev->dev, t, false);
-
 	pci_set_drvdata(pdev, dev);
 
 	if (controller->setup) {
@@ -299,12 +295,7 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 			return r;
 	}
 
-	i2c_dw_adjust_bus_speed(dev);
-
-	if (has_acpi_companion(&pdev->dev))
-		i2c_dw_acpi_configure(&pdev->dev);
-
-	r = i2c_dw_validate_speed(dev);
+	r = i2c_dw_fw_parse_and_configure(dev);
 	if (r)
 		return r;
 

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -21,7 +21,6 @@
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
@@ -97,43 +96,11 @@ static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
 	dev->map = devm_regmap_init(dev->dev, NULL, dev, &bt1_i2c_cfg);
 	return PTR_ERR_OR_ZERO(dev->map);
 }
-
-#define MSCC_ICPU_CFG_TWI_DELAY		0x0
-#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE	BIT(0)
-#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER	0x4
-
-static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
-{
-	writel((dev->sda_hold_time << 1) | MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
-	       dev->ext + MSCC_ICPU_CFG_TWI_DELAY);
-
-	return 0;
-}
-
-static void i2c_dw_of_configure(struct device *device)
-{
-	struct platform_device *pdev = to_platform_device(device);
-	struct dw_i2c_dev *dev = dev_get_drvdata(device);
-
-	switch (dev->flags & MODEL_MASK) {
-	case MODEL_MSCC_OCELOT:
-		dev->ext = devm_platform_ioremap_resource(pdev, 1);
-		if (!IS_ERR(dev->ext))
-			dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
-		break;
-	default:
-		break;
-	}
-}
 #else
 static int bt1_i2c_request_regs(struct dw_i2c_dev *dev)
 {
 	return -ENODEV;
 }
-
-static inline void i2c_dw_of_configure(struct device *device)
-{
-}
 #endif
 
 static int txgbe_i2c_request_regs(struct dw_i2c_dev *dev)
@@ -242,7 +209,6 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 {
 	struct i2c_adapter *adap;
 	struct dw_i2c_dev *dev;
-	struct i2c_timings *t;
 	int irq, ret;
 
 	irq = platform_get_irq(pdev, 0);
@@ -271,18 +237,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 
 	reset_control_deassert(dev->rst);
 
-	t = &dev->timings;
-	i2c_parse_fw_timings(&pdev->dev, t, false);
-
-	i2c_dw_adjust_bus_speed(dev);
-
-	if (pdev->dev.of_node)
-		i2c_dw_of_configure(&pdev->dev);
-
-	if (has_acpi_companion(&pdev->dev))
-		i2c_dw_acpi_configure(&pdev->dev);
-
-	ret = i2c_dw_validate_speed(dev);
+	ret = i2c_dw_fw_parse_and_configure(dev);
 	if (ret)
 		goto exit_reset;
 
@@ -310,6 +265,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 		goto exit_reset;
 
 	if (dev->clk) {
+		struct i2c_timings *t = &dev->timings;
 		u64 clk_khz;
 
 		dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;